I'll sometimes read the comments posted on digg.com, and many people on there who saw the whole episode are saying that she is simply acting dumb. I'm sure she is no genius, but they're saying on many answers she will act up and say she doesnt know, only to come back and get the correct answer. I would like to see the whole episode merely to check her out some more!
(She is also @ $10,000 on that question, so I would assume she had to know a bit to get there).
Many are stating that playing dumb is common in many of the southern states, as many men like the dumb ditzy blonde type.